|Publication number||US181653 A|
|Publication date||Aug 29, 1876|
|Publication number||US 181653 A, US 181653A, US-A-181653, US181653 A, US181653A|
|Inventors||Napoleon Du Brul|
|Export Citation||BiBTeX, EndNote, RefMan|
|Referenced by (2), Classifications (1)|
|External Links: USPTO, USPTO Assignment, Espacenet|
UNITED STATES PATENT FTTCEr NAPOLEON DU BRUL, OFY CINCINNATI, OHIO.
IMPROVEMENT lN SLATES.
Specification forming part of Letters Patent No. l S [,653, dated August 29, 1876; application filed July 6, 1876.
To all whom it may concern Beit known that I, NAPOLEON DU BRUL, of Cincinnati, Hamilton county, Ohio, have invented a new and useful Improvement in Slates, of which the following is a specification:
This invention relates to a school or writing slate having a solid frame; and it consists in forming the letters of the alphabet in the face of said frame in depressed characin intaglio, so that the washin g or wear of the frame shall not obliterate the inscription.
I am aware that a slate-frame has heretofore been made with indentations on its surface to form a scale to indicate length. This, therefore, I do not claim but What I do claim as new, and desire to secure by Letters Patent, is-
As a new article of manufacture, a slate having a solid frame, with the letters of the alphabet in the face of said frame in depress characters, to form a permanent and correct copy for the user of the slate, as herein set forth.
ln testimony of which invention I hereunto set my hand.
l NAPOLEON DU BRUL.
GEO. H. KNIGHT, HORACE E. JOHNSON.
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US6416329 *||Aug 8, 2000||Jul 9, 2002||Kyowa Electric And Chemical Co., Ltd.||Writing device for practice in writing characters|
|US6884082 *||Sep 29, 2003||Apr 26, 2005||Donna James||Sensory feedback educational tool|